CA2125138A1 - Magnetometer of increased sensitivity, selectivity and dynamic range - Google Patents

Magnetometer of increased sensitivity, selectivity and dynamic range

Info

Publication number
CA2125138A1
CA2125138A1 CA002125138A CA2125138A CA2125138A1 CA 2125138 A1 CA2125138 A1 CA 2125138A1 CA 002125138 A CA002125138 A CA 002125138A CA 2125138 A CA2125138 A CA 2125138A CA 2125138 A1 CA2125138 A1 CA 2125138A1
Authority
CA
Canada
Prior art keywords
selectivity
dynamic range
winding structure
methods
properties
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002125138A
Other languages
French (fr)
Other versions
CA2125138C (en
Inventor
Neil J. Goldfine
James R Melcher (Deceased)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Massachusetts Institute of Technology
Original Assignee
Neil J. Goldfine
James R Melcher (Deceased)
Melcher, Janet D.
Massachusetts Institute Of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neil J. Goldfine, James R Melcher (Deceased), Melcher, Janet D., Massachusetts Institute Of Technology filed Critical Neil J. Goldfine
Priority to CA002443248A priority Critical patent/CA2443248C/en
Publication of CA2125138A1 publication Critical patent/CA2125138A1/en
Application granted granted Critical
Publication of CA2125138C publication Critical patent/CA2125138C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
    • G01B7/105—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring thickness of coating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
    • G01R33/1223—Measuring permeability, i.e. permeameters

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

Apparatus and methods are disclosed which provide increased sensitivity, selectivity, and dynamic range for noncontact measurement of actual physical and/or kinematic properties of conducting and magnetic materials. The apparatus and methods are based upon various methods for increasing sensitivity, selectivity and dynamic range through proper construction of a magnetometer sensor and for proper selection of operating point parameters for the application.
A measurement apparatus for measuring one or more MUT (12) properties includes an electromagnetic winding structure (2) which, when driven by an electric signal, imposes a magnetic field in the MUT (12) and senses an electromagnetic response. An analyzer (14) is provided for applying the electric signal to the winding structure. A
property estimator (26) is coupled to the winding structure and translates sensed electromagnetic responses into estimates of one or more preselected properties of the material.
CA002125138A 1991-12-06 1992-11-30 Magnetometer of increased sensitivity, selectivity and dynamic range Expired - Lifetime CA2125138C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002443248A CA2443248C (en) 1991-12-06 1992-11-30 Magnetometer of increased sensitivity, selectivity and dynamic range

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US803,504 1991-12-06
US07/803,504 US5453689A (en) 1991-12-06 1991-12-06 Magnetometer having periodic winding structure and material property estimator
PCT/US1992/010324 WO1993011426A1 (en) 1991-12-06 1992-11-30 Magnetometer of increased sensitivity, selectivity and dynamic range

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002443248A Division CA2443248C (en) 1991-12-06 1992-11-30 Magnetometer of increased sensitivity, selectivity and dynamic range

Publications (2)

Publication Number Publication Date
CA2125138A1 true CA2125138A1 (en) 1993-06-10
CA2125138C CA2125138C (en) 2005-02-15

Family

ID=25186679

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002125138A Expired - Lifetime CA2125138C (en) 1991-12-06 1992-11-30 Magnetometer of increased sensitivity, selectivity and dynamic range

Country Status (4)

Country Link
US (5) US5453689A (en)
EP (2) EP1037043A3 (en)
CA (1) CA2125138C (en)
WO (1) WO1993011426A1 (en)

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Also Published As

Publication number Publication date
US5629621A (en) 1997-05-13
EP1037043A3 (en) 2000-09-27
EP1037043A2 (en) 2000-09-20
US5990677A (en) 1999-11-23
US5453689A (en) 1995-09-26
WO1993011426A1 (en) 1993-06-10
EP0615619A4 (en) 1994-10-26
CA2125138C (en) 2005-02-15
EP0615619A1 (en) 1994-09-21
US20010054894A1 (en) 2001-12-27
US6252398B1 (en) 2001-06-26
US6433542B2 (en) 2002-08-13

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